Clarify Wildcard.hasTypeBound() doc

Author: Marcono1234

java/ql/src/semmle/code/java/Generics.qll

@@ -194,6 +194,12 @@ class TypeVariable extends BoundedType, @typevariable {
  * and the second wildcard has a lower bound of `Float`.
  */
 class Wildcard extends BoundedType, @wildcard {
+  /**
+   * Holds if this wildcard is either unconstrained (i.e. `?`) or
+   * has a type bound.
+   */
+  override predicate hasTypeBound() { BoundedType.super.hasTypeBound() }
+
   /**
    * Holds if this wildcard is either unconstrained (i.e. `?`) or
    * has an upper bound.